What technique did the Deep Space Climate Observatory (DSCOVR) employ using EPIC to show a fully sunlit view of the far side in 2015?
Answer
It imaged the Moon passing directly in front of the Earth.
In July 2015, the Deep Space Climate Observatory (DSCOVR) satellite, situated approximately 1.6 million kilometers away from Earth, provided a unique perspective. It used its Earth Polychromatic Imaging Camera (EPIC) to observe the Moon moving across the face of the Earth from its distant vantage point. This specific configuration allowed for the capture of a completely illuminated face of the Moon—the far side—over a period of several hours, illustrating the Moon's phases as viewed from deep space, rather than from Earth's orbit.
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